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I experienced something similar to this in my 235 years ago. The static system did not include a "loop" over the top of the cabin to force any liquid in the line to drain back out the port, and there was a small static leak causing the tube to draw air into the cabin (in flight the cabin tends to have lower pressure than the static port position). The result was that when flying through rain water would be "sucked into the line," and would settle in the lowest spot causing "burping" (large momentary transients). Alternate static always immediately corrected the problem.
This scenario was more extreme than you report, but is an example of how ANY problem in the static system can cause dangerous errors.
Regards,
Bill R
Keith Smith wrote:
Hello again,
Watching the videos from previous flights, I notice the VSI/ASI and
altimeter 'bouncing' around (in the case of the altimeter +/- 10-15ft)
after power is applied during the takeoff run.
I haven't yet established more a pattern than that (ie. any trends
related to engine power or speed once airborne), but the problem is
more or less consistent. I haven't tried engaging the alt static port
in flight, but will do that on tomorrow's test flight before the plane
goes to the shop.
Has anyone encountered anything like this before? I have seen cockpit
videos of other 360's and haven't seen the issue, so it's certainly
not a problem native to the design of the aircraft.
I'm not sure if there is a burble around the static port due to some
strange airflow around the ports, or if there's a small blockage
within the static system.
Any thoughts on likely causes? I'll report back after the alt static
test tomorrow, and then, ultimately on the diagnosis from the shop
once it's done.
Thanks,
Keith
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